Ignition Coil UF550 and Spark Plugs 1406 Compatible with 3.5 V6 - Set

In this review the Ignition Coil UF550 and Spark Plugs 1406 set is judged on fit, durability and value for owners of Nissan and Infiniti 3.5L V6 models. The bottom line: this kit is for drivers who need a complete six-cylinder ignition refresh and want a close OE-level replacement that restores lost power and smooth idle. The reviewer found the coils use quality materials and the iridium spark plugs deliver improved cold starts, while noting buyers should double-check OE numbers to ensure correct fit.

Key Features

• Direct fit compatibility: Covers a wide range of Nissan and Infiniti 3.5L V6 models so buyers can replace all six coils and plugs in one service session.
• Durable coil construction: Coils are made with silicon steel, Japan-imported rubber and varnished wire to improve longevity under heat and vibration.
• Iridium spark plugs: Professional-grade iridium electrodes and special ceramic help faster starts and more stable acceleration after installation.
• OE reference clarity: Seller lists multiple OE numbers to help confirm fit before ordering, reducing the risk of buying the wrong part.
• Improved drivability: Replacing worn coils and plugs can correct misfires, rough idle and poor fuel economy for a smoother running engine.

Who It's For

This kit is best for owners of Nissan 3.5L 350Z, Altima, Maxima, Murano, Pathfinder, Quest and Infiniti 3.5L EX35, FX35, G25/G35, JX35, Q50/Q70/QX60 model years listed in the product fitment. It suits DIY mechanics and independent shops who prefer replacing all six ignition components at once to restore engine performance.

Customers who should look elsewhere include those who drive non-3.5L engines, need single-coil purchases, or who cannot verify OE compatibility from the detailed list; a precise fit check is important because a few buyers reported plug connector fit issues.

Pros & Cons

Pros

• Restores lost power and smooth idle when original coils or plugs are worn.
• High-quality materials in coils and iridium plugs improve durability and starting performance.
• Good value for a full set of six ignition coils and plugs compared with buying pieces separately.
• Most customers find the kit easy to install during routine maintenance.

Cons

• Some users reported fitment variation at the electrical plug connection, so verification against OE numbers is required.
• Limitations include the need to check listed OE references carefully to avoid ordering the wrong variant.

Specifications

Our Verdict

The UF550 coil and 1406 spark plug six-piece kit is a practical, cost-effective option for owners of compatible Nissan and Infiniti 3.5L V6s who need to eliminate misfires and regain engine smoothness. It offers OE-style materials and iridium plugs for improved starting and longevity, but buyers must verify the listed OE numbers for exact fitment to avoid connector issues. Overall it represents strong value for complete ignition maintenance.

Frequently Asked Questions

Will these fit my 2010 Maxima?
Check the OE references listed and the 3.5L Maxima fitment years; the product lists 2009-2014 and 2016-2020 Maxima as compatible.

Are the spark plugs pre-gapped?
The description emphasizes iridium plugs and ceramic construction but buyers should verify gap or set to manufacturer spec during installation.

Do the coils come as direct replacements?
Yes, the coils are sold as direct replacements with multiple OE numbers provided, though confirm connector fit before installation.